Keystone - ProForm Clear (12/Pk)Pro form manufactures a pre made laminated mouthguard material. By laminating two layers of soft EVA together, the laminate has excellent tensile strength. All of these features make the Pro form mouthguard laminate the material of choice for custom made mouthguards. They are square cut to 5"x 5". Features and Benefits Pre made laminate Excellent tensile strength 5" x 5" Size 0. 160" Thickness (4mm)